FWIW ... my 2007 Tundra's (5.7, RCLB) transmission went out at about 500 miles. The dealer gave me a Camry to drive, put in a new transmission a few days later and Toyota Corp. gave me a $00.00 Deductible - 7 Year Platinum Warranty for my troubles. I have owned many Toyotas and they have always been fair to me.
I traded that 2007 Tundra in on a 2009 Tacoma and that Platinum Warranty ended up costing Toyota nothing and I bought another truck from them.
PS ... I don't know all of your details, but, you can buy that Platinum Warranty on line for probably less than $1,000 for the full 8 years/125K. As you know, those things are pure profit for the dealer.